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better locking to prevent any possible memory access error

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This commit is contained in:
Chris Lu 2013-07-15 21:34:43 -07:00
parent b409ccc5ab
commit dd2245956f
1 changed files with 15 additions and 0 deletions
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15
go/topology/volume_layout.go
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@ -5,6 +5,7 @@ import (
"errors"
"log"
"math/rand"
"sync"
)
type VolumeLayout struct {
@ -13,6 +14,7 @@ type VolumeLayout struct {
writables []storage.VolumeId // transient array of writable volume id
pulse int64
volumeSizeLimit uint64
accessLock sync.Mutex
}
func NewVolumeLayout(repType storage.ReplicationType, volumeSizeLimit uint64, pulse int64) *VolumeLayout {
@ -26,6 +28,9 @@ func NewVolumeLayout(repType storage.ReplicationType, volumeSizeLimit uint64, pu
}
func (vl *VolumeLayout) RegisterVolume(v *storage.VolumeInfo, dn *DataNode) {
vl.accessLock.Lock()
defer vl.accessLock.Unlock()
if _, ok := vl.vid2location[v.Id]; !ok {
vl.vid2location[v.Id] = NewVolumeLocationList()
}
@ -121,6 +126,9 @@ func (vl *VolumeLayout) setVolumeWritable(vid storage.VolumeId) bool {
}
func (vl *VolumeLayout) SetVolumeUnavailable(dn *DataNode, vid storage.VolumeId) bool {
vl.accessLock.Lock()
defer vl.accessLock.Unlock()
if vl.vid2location[vid].Remove(dn) {
if vl.vid2location[vid].Length() < vl.repType.GetCopyCount() {
log.Println("Volume", vid, "has", vl.vid2location[vid].Length(), "replica, less than required", vl.repType.GetCopyCount())
@ -130,6 +138,9 @@ func (vl *VolumeLayout) SetVolumeUnavailable(dn *DataNode, vid storage.VolumeId)
return false
}
func (vl *VolumeLayout) SetVolumeAvailable(dn *DataNode, vid storage.VolumeId) bool {
vl.accessLock.Lock()
defer vl.accessLock.Unlock()
if vl.vid2location[vid].Add(dn) {
if vl.vid2location[vid].Length() >= vl.repType.GetCopyCount() {
return vl.setVolumeWritable(vid)
@ -139,6 +150,10 @@ func (vl *VolumeLayout) SetVolumeAvailable(dn *DataNode, vid storage.VolumeId) b
}
func (vl *VolumeLayout) SetVolumeCapacityFull(vid storage.VolumeId) bool {
vl.accessLock.Lock()
defer vl.accessLock.Unlock()
log.Println("Volume", vid, "reaches full capacity.")
return vl.removeFromWritable(vid)
}